Development of porous Pt/IrO2/carbon paper electrocatalysts with enhanced mass transport as oxygen electrodes in unitized regenerative fuel cells

Byung Seok Lee; Hee Young Park; Min Kyung Cho; Jea Woo Jung; Hyoung Juhn Kim; Dirk Henkensmeier; Sung Jong Yoo; Jin Young Kim; Sehkyu Park; Kwan Young Lee; Jong Hyun Jang

doi:10.1016/j.elecom.2016.01.002

Development of porous Pt/IrO₂/carbon paper electrocatalysts with enhanced mass transport as oxygen electrodes in unitized regenerative fuel cells

Byung Seok Lee, Hee Young Park, Min Kyung Cho, Jea Woo Jung, Hyoung Juhn Kim, Dirk Henkensmeier, Sung Jong Yoo, Jin Young Kim, Sehkyu Park, Kwan Young Lee, Jong Hyun Jang

Department of Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

The oxygen electrodes in unitized regenerative fuel cells (URFC) must have high activities towards oxygen reduction reaction (ORR) as well as oxygen evolution reaction (OER), thus requiring high loading of noble metal electrocatalysts. In this study, porous Pt/IrO₂/carbon paper (CP) electrocatalysts were developed to reduce the metal loading. The Pt/IrO₂/CP electrodes were fabricated by sequential formation of IrO₂ layers (loading 0.1 mg cm^-2) and porous Pt layers (0-0.3 mg cm^-2) on CP substrates by electrodeposition and spraying techniques, respectively. The fuel cell (FC) performances increased linearly up to 0.69 A cm^-2 with increasing Pt loading (up to ∼ 0.3 mg cm^-2) at 0.6 V, whereas the water electrolysis (WE) activity was highest at Pt loading of 0.2 mg cm^-2. The current densities in the FC and WE modes and round-trip efficiency of the developed Pt/IrO₂/CP electrodes with the oxygen electrocatalysts loadings of 0.3 and 0.4 mg cm^-2 were higher or comparable to previously reported values with higher loading (1.5-4.0 mg cm^-2). These high performances with low loading are probably due to the facile oxygen and water transport through well-developed macropores originating from the open CP structures, providing effective utilization of the IrO₂ and Pt electrocatalysts towards OER and ORR, respectively.

Original language	English
Pages (from-to)	14-17
Number of pages	4
Journal	Electrochemistry Communications
Volume	64
DOIs	https://doi.org/10.1016/j.elecom.2016.01.002
Publication status	Published - 2016 Mar 1

Keywords

Iridium oxide
Oxygen electrode
Platinum
Unitized regenerative fuel cell

ASJC Scopus subject areas

Electrochemistry

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10.1016/j.elecom.2016.01.002

Cite this

Lee, B. S., Park, H. Y., Cho, M. K., Jung, J. W., Kim, H. J., Henkensmeier, D., Yoo, S. J., Kim, J. Y., Park, S., Lee, K. Y., & Jang, J. H. (2016). Development of porous Pt/IrO₂/carbon paper electrocatalysts with enhanced mass transport as oxygen electrodes in unitized regenerative fuel cells. Electrochemistry Communications, 64, 14-17. https://doi.org/10.1016/j.elecom.2016.01.002

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title = "Development of porous Pt/IrO2/carbon paper electrocatalysts with enhanced mass transport as oxygen electrodes in unitized regenerative fuel cells",

abstract = "The oxygen electrodes in unitized regenerative fuel cells (URFC) must have high activities towards oxygen reduction reaction (ORR) as well as oxygen evolution reaction (OER), thus requiring high loading of noble metal electrocatalysts. In this study, porous Pt/IrO2/carbon paper (CP) electrocatalysts were developed to reduce the metal loading. The Pt/IrO2/CP electrodes were fabricated by sequential formation of IrO2 layers (loading 0.1 mg cm-2) and porous Pt layers (0-0.3 mg cm-2) on CP substrates by electrodeposition and spraying techniques, respectively. The fuel cell (FC) performances increased linearly up to 0.69 A cm-2 with increasing Pt loading (up to ∼ 0.3 mg cm-2) at 0.6 V, whereas the water electrolysis (WE) activity was highest at Pt loading of 0.2 mg cm-2. The current densities in the FC and WE modes and round-trip efficiency of the developed Pt/IrO2/CP electrodes with the oxygen electrocatalysts loadings of 0.3 and 0.4 mg cm-2 were higher or comparable to previously reported values with higher loading (1.5-4.0 mg cm-2). These high performances with low loading are probably due to the facile oxygen and water transport through well-developed macropores originating from the open CP structures, providing effective utilization of the IrO2 and Pt electrocatalysts towards OER and ORR, respectively.",

keywords = "Iridium oxide, Oxygen electrode, Platinum, Unitized regenerative fuel cell",

author = "Lee, {Byung Seok} and Park, {Hee Young} and Cho, {Min Kyung} and Jung, {Jea Woo} and Kim, {Hyoung Juhn} and Dirk Henkensmeier and Yoo, {Sung Jong} and Kim, {Jin Young} and Sehkyu Park and Lee, {Kwan Young} and Jang, {Jong Hyun}",

note = "Funding Information: This study was supported by the Korean Government through the New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by MOTIE (No. 20133030011320 and No. 20143010031770 ), the National Research Foundation of Korea (NRF) Grant funded by MSIP (2014, University-Institute Cooperation Program and No. NRF-2015M1A2A2056555 ), and the Global Frontier R&D Program at the Center for Multiscale Energy System funded by the NRF, MSIP (No. 2012M3A6A7054283 ). This study was also financially supported by the KIST through the Institutional Project . S. P. acknowledges the financial support from the NRF (No. NRF-2014R1A1A2057667 ). Publisher Copyright: {\textcopyright} 2016, Elsevier B.V. All rights reserved.",

year = "2016",

month = mar,

day = "1",

doi = "10.1016/j.elecom.2016.01.002",

language = "English",

volume = "64",

pages = "14--17",

journal = "Electrochemistry Communications",

issn = "1388-2481",

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T1 - Development of porous Pt/IrO2/carbon paper electrocatalysts with enhanced mass transport as oxygen electrodes in unitized regenerative fuel cells

AU - Lee, Byung Seok

AU - Park, Hee Young

AU - Cho, Min Kyung

AU - Jung, Jea Woo

AU - Kim, Hyoung Juhn

AU - Henkensmeier, Dirk

AU - Yoo, Sung Jong

AU - Kim, Jin Young

AU - Park, Sehkyu

AU - Lee, Kwan Young

AU - Jang, Jong Hyun

N1 - Funding Information: This study was supported by the Korean Government through the New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by MOTIE (No. 20133030011320 and No. 20143010031770 ), the National Research Foundation of Korea (NRF) Grant funded by MSIP (2014, University-Institute Cooperation Program and No. NRF-2015M1A2A2056555 ), and the Global Frontier R&D Program at the Center for Multiscale Energy System funded by the NRF, MSIP (No. 2012M3A6A7054283 ). This study was also financially supported by the KIST through the Institutional Project . S. P. acknowledges the financial support from the NRF (No. NRF-2014R1A1A2057667 ). Publisher Copyright: © 2016, Elsevier B.V. All rights reserved.

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The oxygen electrodes in unitized regenerative fuel cells (URFC) must have high activities towards oxygen reduction reaction (ORR) as well as oxygen evolution reaction (OER), thus requiring high loading of noble metal electrocatalysts. In this study, porous Pt/IrO2/carbon paper (CP) electrocatalysts were developed to reduce the metal loading. The Pt/IrO2/CP electrodes were fabricated by sequential formation of IrO2 layers (loading 0.1 mg cm-2) and porous Pt layers (0-0.3 mg cm-2) on CP substrates by electrodeposition and spraying techniques, respectively. The fuel cell (FC) performances increased linearly up to 0.69 A cm-2 with increasing Pt loading (up to ∼ 0.3 mg cm-2) at 0.6 V, whereas the water electrolysis (WE) activity was highest at Pt loading of 0.2 mg cm-2. The current densities in the FC and WE modes and round-trip efficiency of the developed Pt/IrO2/CP electrodes with the oxygen electrocatalysts loadings of 0.3 and 0.4 mg cm-2 were higher or comparable to previously reported values with higher loading (1.5-4.0 mg cm-2). These high performances with low loading are probably due to the facile oxygen and water transport through well-developed macropores originating from the open CP structures, providing effective utilization of the IrO2 and Pt electrocatalysts towards OER and ORR, respectively.

AB - The oxygen electrodes in unitized regenerative fuel cells (URFC) must have high activities towards oxygen reduction reaction (ORR) as well as oxygen evolution reaction (OER), thus requiring high loading of noble metal electrocatalysts. In this study, porous Pt/IrO2/carbon paper (CP) electrocatalysts were developed to reduce the metal loading. The Pt/IrO2/CP electrodes were fabricated by sequential formation of IrO2 layers (loading 0.1 mg cm-2) and porous Pt layers (0-0.3 mg cm-2) on CP substrates by electrodeposition and spraying techniques, respectively. The fuel cell (FC) performances increased linearly up to 0.69 A cm-2 with increasing Pt loading (up to ∼ 0.3 mg cm-2) at 0.6 V, whereas the water electrolysis (WE) activity was highest at Pt loading of 0.2 mg cm-2. The current densities in the FC and WE modes and round-trip efficiency of the developed Pt/IrO2/CP electrodes with the oxygen electrocatalysts loadings of 0.3 and 0.4 mg cm-2 were higher or comparable to previously reported values with higher loading (1.5-4.0 mg cm-2). These high performances with low loading are probably due to the facile oxygen and water transport through well-developed macropores originating from the open CP structures, providing effective utilization of the IrO2 and Pt electrocatalysts towards OER and ORR, respectively.

KW - Iridium oxide

KW - Oxygen electrode

KW - Platinum

KW - Unitized regenerative fuel cell

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U2 - 10.1016/j.elecom.2016.01.002

DO - 10.1016/j.elecom.2016.01.002

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AN - SCOPUS:84955454237

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EP - 17

JO - Electrochemistry Communications

JF - Electrochemistry Communications

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